The “Daily Show” host was flying high and hitting low over the homeland security head's ouster. Michael Kosta joked that Kristi Noem ’s rumored affair with Corey Lewandowski preserved her job for a bit before she got fired as homeland security secretary on Thursday. (Watch the video below.) The Wall Street Journal reported recently that Noem and her senior adviser Lewandowski, whose alleged extramarital relationship has been called “ the worst-kept secret in D.C. ,” had been keeping company on